-pound gold nugget setting off an >>> investigators in vallejo confirmed that a weekend fire at the law office of davis is indeed a case of arson. as noelle walker reports, the investigation is on to find out who targeted an official. >> when mayor davis' office went up in flames -- >> disbelief. i'm not fearful for my life. i am concerned for my family. i have written threats, verbal threats. telephone threats but none have risen to the level of this type of dangerous criminal conduct. >> reporter: today the fire chief confirmed the two alarm fire that happened here on saturday morning was no accident. >> we have confirmed that it was an intentional incendiary device that started the fire. >> i can't say why but we believe what happened in his office was indeed arson. >> reporter: being may -- mayor of any city is a good way to make friends and enemies. >> every week you're doing something that somebody is not going to like. >> reporter: davis says his biggest establishments have been getting the -- it's been a winding road for a major who won his first term in a recount by the narrowe